\section*{Future Works}

	Finally, we are providing some ideas for future research. First of all, we designed the data warehouse without taking time zones into account. This will inevitably cause problems with the \textit{Date} and \textit{Time} dimensions -- if we ask for the average amount of bags traveling through airports in the morning, for example, this morning-time should be localized for the airports. Also, if we were to have more date types, accounting for holidays and such, these holidays would depend on the country.
	
	Furthermore, being able to measure flight delays would be of great use. This will, to some degree, be achievable by simply checking for readings after the scheduled departure time, which is already stored in the source data. However, if bags were loaded onto an airplane at the correct time, and delays were introduced afterwards, it would not be possible to detect unless RFID readers were put inside the airplane baggage compartment, connected to the navigational equipment of the airplane in order to detect when the airplane leaves the airport. This seems very expensive to implement, and would probably not be feasible.
	
	Performance testing is also a good idea for future works. It is possible to use materialized views \cite{thebookoftorben} to cache the expensive queries and reduce the time spent on receiving the result.